Watch Ellen DeGeneres and Michelle Obama's Uptown Funk dance-off

Michelle Obama joins Ellen DeGeneres for an 'Uptown Funk' dance-off in a clip from an upcoming episode of the US star's chatshow. The enthusiastic First Lady was appearing to celebrate the fifth anniversary of 'Let's Move', her health and fitness campaign. Challenging the host to perform a special routine to Mark Ronson and Bruno Mars's huge hit single, the pair were joined by a group of dancers for the must-see performance. Michelle halted proceedings briefly when some enthusiastic hip-thrusting saw her microphone pack fall off. The full episode of Ellen featuring Michelle Obama will air in the US on Monday, March 16. Yesterday, Barack Obama appeared on Jimmy Kimmel Live in a special edition of 'Mean Tweets'. More stories: Obama includes gay rights movement in Selma memorial speech Sean Penn: 'People will look back through history and say we made gay kids commit suicide'